audiospritler

Concat small audio files into single file and export in many formats for use with Howler.js.

npm install audiospritler
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Build Status

What?

This is a ffmpeg wrapper that will take in multiple audio files and combines them into a single file. Silent gaps will be put between the parts so that every new part starts from full second and there is at least 1 second pause between every part. The final file will be exported in mp3, ogg, ac3, m4a and caf(IMA-ADPCM) to support as many devices as possible. This tool will also generate a JSON file that is compatible with Howler.js.

Who?

The original of this awesome tool was made by tonistiigi (https://github.com/tonistiigi) this is an adjusted (and updated) version to be used for Howler.js

Installation

npm install -g audiospritler

Hints for Windows users

  • You need to install Node.js
  • Use Git Bash instead of Command Line or Powershell
  • Download ffmpeg and include it in your path export PATH=$PATH:path/to/ffmpeg/bin
  • IMA-ADPCM(the fastest iPhone format) will only be generated if you are using OSX.

Usage

> audiospritler --help
info: Usage: audiospritler [options] file1.mp3 file2.mp3 *.wav
info: Options:
  --output, -o      Name for the output file.                                    [default: "output"]
  --export, -e      Limit exported file types. Comma separated extension list.   [default: ""]
  --log, -l         Log level (debug, info, notice, warning, error).             [default: "info"]
  --autoplay, -a    Autoplay sprite name                                         [default: null]
  --silence, -s     Add special "silence" track with specified duration.         [default: 0]
  --samplerate, -r  Sample rate.                                                 [default: 44100]
  --channels, -c    Number of channels (1=mono, 2=stereo).                       [default: 1]
  --rawparts, -p    Include raw slices(for Web Audio API) in specified formats.  [default: ""]
  --help, -h        Show this help message.


> audiospritler --output mygameaudio bg_loop.wav *.mp3
info: File added OK file=bg_loop.wav
info: 1.25s silence gap added OK
info: File added OK file=click.mp3
info: 1.70s silence gap added OK
info: Exported caf OK file=mygameaudio.caf
info: Exported ac3 OK file=mygameaudio.ac3
info: Exported mp3 OK file=mygameaudio.mp3
info: Exported m4a OK file=mygameaudio.m4a
info: Exported ogg OK file=mygameaudio.ogg
info: Exported json OK file=mygameaudio.json
info: All done


> cat mygameaudio.json
{
  "urls": [
    "mygameaudio.caf",
    "mygameaudio.ac3",
    "mygameaudio.mp3",
    "mygameaudio.m4a",
    "mygameaudio.ogg"
  ],
  "sprite": {
    "bg_loop": [
      0, 3750, true
    ],
    "click": [
      5000, 5300
    ]
  }
}

Custom silent track

On some cases starting and pausing a file has bigger latency than just setting playhead position. You may get better results if your file is always playing. --silence <duration> option will generate extra track named silence that you can play instead of pausing the file.

Usage with Howler.js framework.

Generated JSON file can be passed straight into Howl constructor. Check out Howler.js documentation/demos for more info.

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